Means for profiling turbine and compressor-blading



Nov. 20, 1951 w. E. DAZELEY 2,575,855

MEANS FOR PROFILING TURBINEAND COMPRESSOR-BLADING Filed Oct. 51, 1947 2 SHEETS-Sl-IEET 1 ATTORNEYS MEANS FOR PROFILING TURBINE-AND COMPRESSOR-BLADING 2 SHEETS-SHEET 2 Filed Oct. 51, 1947 AHEA /V533 may be, for example, of dove-tail section. A slide I9 is engaged on the guides I8 and is connected at its upper end by a link to a lever 2 l pivoted at the upper end of the bracket H, the lever 2| carrying on its opposite end a counter-weight.

22 for balancing the slide l9. The slide [9 has pivoted to it a scraper-devic 23 which can tilt about an axis parallel to the axis of the slide-bar I4. The lower edge 24 of the scraper 23 is chamfered and is' straight.

It will be appreciated from the above description that the edge 24 of the scraper-device 23 has three possible freedoms of movement, namely-- 7 (a) A movement in a plane parallel to the base-plate by virtue of the sliding movement of the slide-bar l4.

(b A movement in a plane at right angles to the surface of the base-plate by virtue of the sliding movement of the slide I9, and

(c) A canting or tilting movement about its pivot which is at right angles to the edge 24 and substantially parallel to the surface of the' base-plate l0. I The edge 24 can thus be constrained to sweep out any surface defined by a series of straight lines located in a series of planes which are parallel to the plane of the scraper-device 23.

The master form is produced in a box-like,

with a contour corresponding to the contour of one surface of the blade being produced, that is, either the concave or the convex surface, respectively at two stations along the length of the blade. For example, the upper edges of the templates may be given a profile to correspond respectively to that at the root and tip of the blade.

Thus, if the scraper-device 23 is caused to move' with its edge 24 in contact with the upper edges of the temp1ates28 the straight edge 24 will sweep out a surface representing the profile of either the concave or convex surface of the blade being produced.

To produce the master form with this appara-' tus the box-like structure, if desired, provided with end walls 29 is filled with a hard, quickdrying non-shrinking cement such as Calestone or a like material and the box is located on the base-plate ID by engaging dowels 25 in the recesses in the base-plate 26. The scraper-device is then drawn manually across the upper surface of the box-like structure with the edge 24 of the scraper-device in contact with the upper profiled edges of the templates28, thus giving the cement within the box-like receptacle the desired profile,

4 as will be seen from Figure 3, in which the cement filling is indicated by reference numeral 3|.

When the cement has hardened a master form is obtained which can be used to produce a steel die-stamping block such as that illustrated in Figure 4, or may be used for producing dies for coining blades or may be used as a master profile in a copying machine for machining blades. This machine may, if desired, be a final machine of roughly formed blanks.

' "For any blade two master forms will be produced one for profiling the concave blade surface and the other for the convex blade surface.

It will be appreciated that with the apparatus of this invention a master form can be rapidly and accurately produced with very little skill thus facilitating manufacture of compressorand turbine-blades.

, I .claim:

1. Apparatus for producing an accuratelyshaped master form for use in the manufacture of turbine and compressor blades, comprising a base, a box structure to receive a non-shrinking,

settable material positively located on said base and having a pair of side walls at right angles to the base and between the side walls a pair of templates having their upper edges respectively contoured to conform to the desired blading section at two stations spaced along the length of the blade, a pillar carried on said base, a slide bar mounted in the pillar for movement parallel to said base and to the templates of the box structure, a slide carried by the slide bar and arranged for movement at right angles to said base,

and ascraper carried on the slide with a scraper edge at right angles to the directions of movement of the slide bar, said scraper being movably mounted on said slide for edgewise movement relatively to the templates forpermitting the scraper to conform to the contour of the upper edges of the templates for shaping the surface of the settable material in the box structure.

2. Apparatus for producing an accuratelyshaped master form for use in the manufacture of turbine and compressor blades, comprising a base, a box-structure to receive a non-shrinking, settable material positively located onsaid base and having a pair of side walls at right anglesv to the base and between the side walls a pair of templates having their upper edges respectively contoured to conform tothe desired blading section at two stations spaced along the length of the blade, a pillar carried on said base, a slide bar mounted in the pillar for movement parallel to said base and to the templates of the box structure, a slide carried by the slide bar and arranged for movement at right angles to said, base, and a scraper carried on the slide with a scraper edge at right angles to the directions of movement of the slide bar andgthe slide to be guided by said templates'to shape the surface of the settable materialin the box structure, said scraper being pivoted on the slide to be tiltable about an axis which is parallel to the direction of I said box adapted to move from side to side of said box, a slide carried by said slide bar and arranged for movement at substantially right angles to the direction of movement of the slide bar, a scraper carried on said slide having a scraper edge positioned to engage the edges of said templates, said scraper being pivoted on the slide to be tiltable about an axis which is substantially parallel to the direction of movement of the slide bar.

4. An apparatus for producing an accuratelyshaped master form for use in the manufacture of turbine and compressor blades, comprising a container for a non-shrinking, settable material, a pair of templates in said container spaced from one another and having their upper edges contoured difierently to conform to blading sections at two stations spaced along the length of the blade, a scraping blade arranged substantially at right angles to said templates and of a length to simultaneously and continuously contact the differentially contoured upper edges of said templates as the scraping blade is moved therealong, a carrier for supporting and moving said scraping blade lengthwise along said upper edges of the templates, means for urging the scraping blade toward said upper edges of the templates during its movement along such edges, and means for pivotally mounting said scraping blade to rock edgewise to permit local portions of the blade above the respective templates to accurately follow the differentially formed contours of the upper edges of said templates whereby the scraping blade wipes over the material in the container to produce a molded material having an upper surface in exact replica of the corresponding surface of the blade to be formed.

WALTER. EDWARD DAZELEY.

REFERENCES CITED The following references are of record in the file of this patent:

UNITED STATES PATENTS Number Name Date 197,539 Blair Nov. 27, 1877 772,597 Williamson Oct. 18, 1904 787,075 Burgum Apr. 11, 1905 1,210,318 Horton Dec. 26, 1916 1,268,226 Flood June 4, 1918 1,988,315 Jackson Jan. 15, 1935 2,061,497 Beauchamp Nov. 17, 1936 2,180,872 Ford Nov. 21, 1939 2,301,140 Pfeiffer Nov. 3, 1942 2,413,540 Bloore Dec. 31, 1946 2,465,019 Johnson Mar. 22, 1949 

